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UPD70732GD-16-LBB Datasheet(PDF) 8 Page - NEC |
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UPD70732GD-16-LBB Datasheet(HTML) 8 Page - NEC |
8 / 66 page 8 µPD70732 1. PIN FUNCTIONS 1.1 Pin Function List Bus hold status during operation A31 to A1 3-state Address bus Hi-Z Hi-Z HNote (Address Bus) output D31 to D0 3-state Bidirectional data bus Hi-Z Hi-Z Hi-Z (Data Bus) I/O BE3 to BE0 3-state Indicates valid data bus when data is accessed Hi-Z Hi-Z H (Byte Enable) output ST1, ST0 3-state Indicates type of bus cycle Hi-Z Hi-Z H (Status) output DA 3-state Strobe signal for bus cycle Hi-Z Hi-Z H (Data Access) output MRQ 3-state Indicates memory access Hi-Z Hi-Z H (Memory Request) output R/W 3-state Distinguishes between read access and write access Hi-Z Hi-Z H (Read/Write) output BCYST 3-state Indicates start of bus cycle Hi-Z Hi-Z H (Bus Cycle Start) output READY Input Extends bus cycle — — — (Ready) HLDRQ Input Requests bus mastership — — — (Hold Request) HLDAK Output Acknowledges HLDRQ L L H (Hold Acknowledge) SZRQ Input Requests bus sizing — — — (Bus Sizing Request) SIZ16B Input Fixes external data bus width to 16 bits — — — (Bus Size 16 Bit) BLOCK Output Requests to inhibit use of bus L L L (Bus Lock) ICHEEN Input Operates instruction cache — — — (Instruction Cache Enable) INT Input Interrupt request — — — (Maskable Interrupt) INTV3 to INTV0 Input Interrupt level — — — (Interrupt Level) Note A1 pin is “H” in the 16-bit bus fixed mode; otherwise, it is “L”. Bus hold Bus idle Name I/O Function status status at reset at reset |
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